ژئوشیمی ماسه‎سنگ های سازند رازک، جنوب  خاور حوضه رسوبی زاگرس: کاربرد در تعیین جایگاه زمین ساختی، سنگ مادر و هوازدگی دیرینه

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، پژوهشکده ازدیاد برداشت از مخازن نفت و گاز، تهران، ایران

2 استادیار، گروه زمین شناسی، دانشکده علوم، دانشگاه اصفهان، اصفهان، ایران

3 استادیار، گروه زمین شناسی، دانشکده علوم، دانشگاه زنجان، زنجان، ایران

چکیده

در این پژوهش ماسه‌سنگ های سازند رازک در رخنمون های فینو و هندون و میدان سرخون در شمال منطقه بندرعباس، از دید سنگ‌نگاری و ژئوشیمیایی به منظور مطالعه خاستگاه در تعیین جایگاه زمین ساختی، بررسی سنگ مادر و هوازدگی دیرینه مطالعه و همچنین با ماسه‌سنگ های اهواز از سازند آسماری مقایسه شده‌اند. نهشته های سازند رازک بیشتر شامل مارن، ماسه‌سنگ، کنگلومرا و سنگ‌آهک ماسه ای است. نتایج حاصل از بررسی  ژئوشیمیایی عناصر اصلی و فرعی نشان از رسوب گذاری این سازند در حاشیه فعال قاره ای دارد. تحلیل خاستگاه سنگ های سیلیسی آواری سازند رازک نشان‌دهنده سنگ های مادر از جنس آذرین مافیک و حدواسط، سنگ های دگرگونی درجه پایین تا بالا و سنگ های رسوبی برای این سازند است. بررسی اندیس هوازدگی شیمیایی نیز نشان داد که رسوبات در ناحیه منشأ دچار هوازدگی متوسط شده اند که بیانگر آب‌وهوای خشک در ناحیه منشأ است. به نظر می رسد رسوبات سازند رازک حاصل فرسایش مخلوطی از سنگ های آذرین- افیولیتی پوسته اقیانوسی نوتتیس، سنگ های دگرگونی و دیگر توالی های رسوبی نهشته شده در حوضه رسوبی زاگرس در طی تکامل حوضه پیش‌بومی بوده است. تغییر ستبرای گوه ای سازند رازک از مناطق بالادست حوضه رسوبی زاگرس به سوی نواحی پایین دست و در پایان محو شدن آن در بخش فارس ساحلی و حضور کنگلومرای پلی‌میکتیک، ماسه‌سنگ های دانه‌درشت و غنی از خرده‌سنگ از دیگر شواهد منشأ گرفتن سازند رازک از پهنه رورانده زاگرس هستند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Geochemistry of the Razak Formation sandstones, southeastern Zagros sedimentary basin: implications for tectonic setting, parent rocks and palaeoweathering

نویسندگان [English]

  • S. A. Moallemi 1
  • M. A. Salehi 2
  • A. Zohdi 3
1 Assistant Professor, IOR/EOR Institute for Oil and Gas Reservoirs, Tehran, Iran
2 Assistant Professor, Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran
3 Assistant Professor, Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran
چکیده [English]

In this study, the sandstones of the Razak Formation at the Finu and Hanudun outcrops and at Sarkhun Field north of Bandar-Abbas have been investigated by petrography and geochemistry analyses to discriminate provenance for determination of tectonic setting, parent rock and palaeoweathering and for comparison with the Ahwaz Sandstone of Asmari Formation. The Razak Formation mainly consists of marl, sandstone, conglomerate and sandy limestone. The results of geochemical investigation of major and trace elements indicated that the sedimentation of the Razak Formation took place in an active continental margin. Provenance analysis shows that the siliciclastic sediments of the Razak Formation were largely derived from mafic and intermediate igneous, low- to high-grade metamorphic and sedimentary rocks. Chemical weathering indices suggested that their source area underwent a moderate degree of chemical weathering in an arid climate. It seems that the sediments of the Razak Formation are results of erosion from a mixture of ophiolitic-igneous rocks belonging to the Neo-Tethys oceanic crust, metamorphic rocks and other sedimentary strata deposited in Zagros sedimentary basin during foreland basin evolution. Wedge thickness of the Razak Formation changes from the hinterland thrust basin towards the Zagros trough and ridge basin and finally disappears in the coastal Fars region. The presence of polymictic conglomerate and coarse-grained sandstone with abundant rock fragments could be considered as additional evidence for the source of Razak Formation from the Zagros imbricated zone.

کلیدواژه‌ها [English]

  • Geochemistry
  • Provenance
  • Tectonic setting
  • Razak Formation
  • Southeast Zagros

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